Coating machine for sheets of material



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Patented May 9, 1950 COATING MACHINE'FOR SHEETS F MATERIAL I HarryWhitney Osgood, Jr.,

-Westbrook, Maine, assign Company, Boston, Mass,

Massachusetts and Alexander Jones, ors to S. D. Warren a corporation ofApplication September 30, 1946, Serial No. 700,278

4 Claims. 1

This invention relates to a coating machine and more particularly to a,machine for coating separate sheets such as paper, cloth, asbestos.metal, plastic films and the like as distinguished from continuous webs.The machine to be described hereinafter and illustrated in theaccompanying drawings was designed to coat relatively small sheets ofabout five inches width and fifteen inches length but it will beunderstood that the size of the sheets to be coated on a particularmachine may vary and machines of different sizes may be provided. Themachine is useful for instance for coating sheets of paper for testpurposes, 1. e. for test laboratory use and can be used for applying avariety of coating materials such as the conventional mineral coatings,

wash coatings, emulsions, lacquers, etc.

The invention is illustrated in the accompanying drawings in which:

Fig. 1 is an elevation looking at the left hand side of the machine, thefeed end being considered as being the rear end, s

Fig. 1a is a rear view, partly in section of the arm 25, shaft l4,bushing 58 and latch 28 of 1.

Fig. 1b is a top plan view of one front corner of the stock table 2 ofFig. 1,

Fig. 2 is an elevation of the right hand side 0 the machine,

Fig. 3 is an elevation of the right hand end of the carrying or breastroll and the paper gripping mechanism,

Fig. 4 is a front view of the breast roll, and

Figs. 5, 6, 7 and 8 are right hand end views of the breast roll showingthe gripping mechanism in different positions.

The apparatus consists generally of means for supporting and conveying asheet to be coated in a predetermined path, means for applying mobilecoating composition to the sheet as it' moves in said path, an airdoctor for spreading the coating on the sheet and for removing excesscoating material therefrom as the sheet moves in said path and automaticmeans for actuating the coating applying means and the air brush.

The principal parts of the machine. are the frame I, the stock table 2,the breast roll 3 with its gripping mechanism, the coating applyingmechanism 4 and the air doctor or air knife 5.-

The stock table 2 is adjustably supported on the frame I by the hinge 6and the adjustable As appears in Fig. 1b, the front edge of the stocktable is provided with adjustable stops 59 for stopping the forwardmovement of a sheet of paper to be picked up by the gripping 88 U.

2 mechanism on the breast roll and notches 88 through which the grippingmembers 41 pass. The stock table is also provided with an adjustableguide plate 8|.

The breast roll 3 is rotatably supported on the frame I by the shaft 8.It is rotated by the crank 9 through the shaft Ill, cog wheel H and cogwheel I2. Obviously an electric motor or other suitable means may besubstituted for the crank 9 for turning the shaft l8.

The coating applying mechanism comprises the pan 13 secured to androtatable with the shaft I4, the color roll I! rotatably mounted in thepan Hi, the metering roll It also rotatably mounted in the pan I3. Thebearings of the roll l6 are slidably mounted in the frame l1 and areadjustable by means of the screw I8 to vary the distance between themetering r011 l8 and the color roll l5 and thus to vary. the amount ofcoating left on the color roll ii for transfer to the sheet to becoated. Rolls I5 and ii are rotated by the operation of the hand crank 8operating through the cog wheels ll, l2, I9, 28 and 2|, shaft 22, cogwheel 23 and cog wheel 24.

The color roll I5 is raised and lowered into and out of contact with thesheet to be coated carried upon the breast roll 3 by movement of theplunger 21 which is pushed .forward by a piston in the cylinder 3| byair under high pressure supplied through pipe 32 from a source 35 underthe control of valve 34 and cam 33 on the shaft 8. Plunger 21 engagesthe adjustable screw contact 26 on the arm 25. Arm 25 is rotatablymounted on the bushing 58 which is keyed to the shaft I4. Movement ofthe arm 25 is transmitted to the shaft H by the latch 29, pivoted onthe'hub of the arm '25, engaging the notch 28 in the bushing 58. Thiscon-' struction' permits the latch 29 to be disengaged and the color panassembly dropped for emptying and cleaning. The vernier 30, one scale ofwhich is adjustably secured to' the frame I and the other scale of whichis secured to the bushing 58, may be used in setting the position of thecolor roll IS with respect to the breast roll 3. Adjustment of the screwcontact 28 and of the position to which the color roll I5 is raisedtakes care; of different thicknesses of the sheets to be coated and tosome extent regulates the amount of coating applied to the sheet. Cam 33is so shaped and positioned on the shaft 8 as to raise and lower thecolor roll l5 to apply coating to a sheet, carried on the breast roll 3.

The, air doctor 5 is of thetype disclosed in S. Patent No. 2,139,628. Itis adjustably mounted on the shaft 36 supported by the upper end of thearm 31, the lower end of which is secured to the shaft 38. Shaft 38 alsocarries the arm 39, the movement of the free end of which is controlledby the adjustable stops and ll. The air doctor may therefore be adjustedangularly about the axis of the shaft 36 and may be tilted to anadjusted position with its nozzle positioned to act upon the coating ona sheet carried on the breast roll 3 or tilted in the opposite directionto inoperative position.

The pan 42, supported on the frame I beneath the air doctor 5, serves tocatch coating material blown off of the coated sheet by the air doctor5.

The air doctor is supplied, through pipe 45, with low pressurecompressed air at measured intervals adjusted to act upon a coated sheeton the breast roll 3 from the source 62 through the air valve 53, whichis operated by high pressure air supplied through valve 43, controlledby the cam 44 on the shaft 8.

The breast roll 3 includes the means for gripping and holding a sheet onthe roll while coating is applied by the coating-applying mechanism Iand smoothed by the air doctor 5 and then releasing the sheet. The roll3 has a wedgeshaped portion (amounting to about one-fourth of the roll)removed, leaving about three-fourths of the roll surface with leadingand trailing edges. The shaft 4G is rotatably mounted in the ends of theroll 3 adjacent said leading edge and carries a plurality (threeillustrated) of gripping members 41 on the short arms 48 secured to theshaft. The surface of the roll 3 adjacent the leading edge is flattenedto provide the surface 49 which cooperates with the gripping members Asshown in Figs. 5-8, the gripping members 41 are tilted or rotated fromclosed position, shown in Fig. 8 to open position, shown in Figs. 6 and7 by means of the pin cam 50 secured to the end of the shaft 46. The cam50 normally rests against the stop 5| and is pushed to its two restpositions shown in Figs. 6 and 8 by the spring 52. The spring 52 issupported on the plunger 53 which is pivotally connected at one end tothe arm 54 secured to the shaft 46 and at the other end extends looselythrough an opening in the arm 55 secured to the shaft 8. As the roll 3rotates counter-clockwise as seen in Figs. 5 to 8 and as indicated bythe arrows, the cam first engages the pin 56 attached to the frame I asappears in Fig. 5 and is moved from its rest position shown in Fig. 8 tothe position shown in Fig. 5. This movement opens the gripping member 41from the closed or gripping position shown in Fig. 8 to the slightlyopened position shown in Fig. 5. As the roll 3 continues to rotate, thecam 50 is tilted over to the full open position of the gripping mem-'-bers 41 as shown in Fig. 6. It then engages the .pin 5'! attached to theframe I as shown in Fig. '7 and is tilted to the closed position of thegripping members 41 as shown in Fig. 8.

The operation of the apparatus is as follows: Assuming that the breastroll is in the position illustrated in Fig. 6 with the grippers 41 inopen position, that the plunger 21 is in retracted position and thecolor applying mechanism 4 is in lowered position (not shown) and thatthe air doctor 5 is in operative position as illustrated in Figs. 1 and2, a sheet of paper or the like on the stock table 2 is pushed forwardwith its edge against the stops 59 where it can be engaged by thegrippers 41 which are moved to closed or gripping position at this point(see Fig. 8) by operation of the pin cam 50. The breast roll continuesto move forward pulling the sheet with it and the color applyingmechanism is raised to bring the color roll i5 into contact wlth thepaper by the action of the cam 33. The application of coating to thesheet continues as the sheet moves forward so long as the cam 33 holdsthe color roll 15 in elevated position. The cam 33 may be set to stopthe application of coating at or near the end of the sheet. Cam I4 isset to cause the air doctor 5 to act on the coated sheet to smooth thecoating and remove excess coating and may be set to act on any length ofsheet or any portion of the sheet. The breast roll continues to rotateafter the sheet has been coated and the coating smoothed and arrives atthe position shown in Fig. 5 where the grippers 41 are opened and thecoated sheet released and is caught and removed by the operator.

In operation of the machine it may be desirable to stir the coating inthe pan 13 before a coating operation is started or for some otherreason to run the machine without applying coating. This can be done bysimply shutting off the compressed air supply so that while the rollsare turned the coating roll remains out of contact with the breast roll.

We claim:

1. Apparatus for coating sheet material comprising a member having asheet supporting surface adapted to be moved in a predetermined closedpath, means carried by said member for gripping a sheet to be coated atone predetermined point in said path and for releasing said sheet atanother predetermined point in said path, means positioned between saidtwo points in said path for applying coating material to a sheet carriedon said supporting surface, means between said two points in said pathfor smoothing coating on a sheet carried on said surface, means forautomatically actuating said means for gripping and releasing the sheetto be coated and means for automatically moving said coating-applyingmeans into coating applying position and for retracting said coatingapplying means after the movement of a predetermined portion of saidsurface past said coating-applying means.

2. Apparatus as defined in claim 1 in which the means for smoothing thecoating on the sheet is an air doctor pivotally mounted independently ofthe coating applying means to be moved toward and away from said sheetsupporting surface.

3. Apparatus for coating sheet material comprising a sector amounting tomore than of a cylinder mounted to revolve on its axis, means adjacentthe leading edge of said sector for gripping and releasing the edge of asheet to be coated, a pan for coating material, a color roll and ametering roll mounted to revolve in and move with said pan, said panbeing mounted to pivot about a fixed axis from a position with the colorsoil in contact with said sector to a position with said color rollclear of said sector, an air doctor mounted to pivot about a fixed axisspaced apart from the axis of the pan from a position with the airdoctor nozzle in contact with said sector to a position with said nozzleclear of said sector, means for rotating said sector and said color andmetering rolls. means for periodically closing and opening said sheetgripping means, automatic means for periodically moving said pan aboutits axis to bring said color roll in 8 contact with said sector andreturn it to rest P051- tion and automatic means for periodicallydelivering air under pressure to said air doctor.

4. Apparatus as defined in "claim 3 comprising cams mounted on the axleof said sector to turn therewith and means operated by said cams formoving the color pan about its axis and for admitting air under pressureto said air doctor.

HARRY WHITNEY OSGOOD, J11. ALEXANDER JONES.

REFERENCES CITED The following references are of record in the file orthis patent:

6 unrmn STATES PATENTS Number Name Date George May 25, 1869 Dooley Jan.29, 1878 Spencer July 23, 1878 Chambers et a1. Oct. 4, 1881 Dausman Apr.4, 1916 King Jan. 5, 1937 Terry Dec. 6, 1938 Melton at al Dec. 24, 1940Johnson Aug. 12, 1941 Certificate of Correction Patent No. 2,507,418 May9, 1950 HARRY WHITNEY OSGOOD, Jn, ET AL.

It is hereby certified that error appears in the printed specificationof the above numbered patent requiring correction as follows:

Column 4, line 65, for soil read roll;

and that the said Letters Patent should be read with this correctiontherein that the same may conform to the record of the case in thePatent Ofiice.

Signed and sealed this 18th day of July, A. D. 1950.

J OE E. DANIELS,

Assistant Commissioner of Patents.

